Floor-dressing machine.



A. KRAEMBB. & A. CHILD.

FLOOR DRESSING MACHINE.

APPLICATION FILED SEPT. '1, 1907.

Patented Dec. 8, 1908. 4 SHEETS-SHEET 1` wi bnc osea ww A. KRAEMER & A.CHILD. FLOOR DRESSING MACHINE.

APPLICATION FILED SEPT. 7, 1907.

906,035. Patented Dec. s', 1908.

4 SHEETS-SHEET 2.

QQ@ UIMM Il llllllw Q u @Moen/tow w42 km0/oom WML szw@ wi limes oc o@MM-.f @MW @am A. KRAEMBR & A. CHILD.

FLOOR DRESSING MACHINE.

APPLICATION FILED SEPT. '7, 1907.

Patented Dec. 8,1908.

4 SHEETS-SHEET 3.

jkmm 34- A. KRABMER & A. CHILD.

FLOOR DRESSING MACHINE.

APPLICATION FILED SEPT. 7, 1907.

Patented Dec. 8, 1908.

4 SHEETS-SHEET 4.

C] Hof/neu @sul neooco @wf'f/ SZQW Vl O UNITED sTATEsPjATENr orrioa. t

AUGUST KRAEMER AND ARTHUR CHILD, F DENVER, COLORADO; SAID KRAEMERASSIGNOR TO SAID CHILD.

FLOOR-DRESSING MACHINE.

Specification of Letters Patent.

Patented Dec. 8, 1908.

Application filed September 7, 1.907. Serial No. 391,774.

z. such as will enable others skilled in the art to which it appertainsto make and use the saine, reference being had to the accompanyingdrawings, and to the letters and figures of reference marked thereon,which form a part of this specification.l

Our invention relates to improvements in floor dressing machines of theclass in which an operating motor preferably electric is mounted upon amovable platform and with which the abrading, surfacing or floordressing device is connected in such a manner that it is allowed toswing freely from an axis coinciding with the axis of the armature shaftof the motor. In our improved construction this motor serves to impart arotary movement to the abrading device upon its own axis and also anorbital travel to the frame in which the abrading device is rotatablymounted. The axis of the orbital travel of the roller-carrying frame isat right angles to the axis of the abrading roller. Provision is alsomade yfor automatically removing the l.ibrading dust or par ticlcs takenfrom the floor by the abrading device, by suitable suction mechanism. Inour improved construction the frame carrying the abrading roller ispermitted a limited degree of oscillating movement, whereby the abradingroller is adapted to accommodate itself to floors that are not exactlylevel or which do not liein a horizontal plane. This is considered avery important feature of the device. The oscillation is in a directionlengthwise of the roller, whereby either of its extremities may occupy aposition above or below the other as may be required by the condition ofthe Hoor in any particular case.

Having briefly outlined our improved construction, we will proceed todescribe the same in detail reference being made to the accompanyingdrawing in which is illustrated an embodiment thereof.

In this drawing, Figure 1 is a side elevation of our improved machinepartly in sect-ion. Fig. 2 is a. top plan view of the same.

Fig. 3 is an elevation of the abrading device shown in detail and on alarger scale. Fig. Il is a sectional view of the same. Fi 5 is a. crosssection taken through the abra ing roller. Fig. 6 is a section of thcabrading roller taken on the line 66 Fig. 4. Fig. 7 is a fragmentaryview of the abrading roller illustrating means for fastening oneextremity of the abrading material thereto. Fig. 8 is a similar View ofthe opposite eX- tremity of the roller showing a device for fastenmgtheother extremity of the abrading strip of material. Fig. 9 is afragmentary top plan view of the frame in which the abrading roller ismounted. Fig. 10 is a section taken on the line 10-10 Fig. 9.

The same reference characters indicate the same parts in all the views.V

Let the numeral 5 designate a platform mounted on rollers 6. Connectedwith the rear extremity of the platform as shown in the drawing are thelower extremities of two brace bars 7 whose upper extremities areconnected with a transverse frame bar 8 by means of suitable fasteningdevices 9. The top frame -bar 8 is provided at its opposite extremitieswith depending members 10 which are also secured to the platform bybolts l2 passed through flanges 13 which engage the platform.

Connected with the frame bars 7 are angle-shaped brackets 14E havingvertical members 15 to which the body 17 of the'motor is securedas shownat 16. The armature shaft 11 of the motor is ournaled at its upperextremity in the transverse top bar 8.

Pivotally connected with the upper eX- tremity of the shaft 11, is aforwardly extending short bar 18 which is rigidly secured by bolts 20 toa top frame barl 19 which is connected with a bottom frame bar 21 bymeans of an upright 22. The bottom frame bar 21 is connected with ashort bar or plate 23 by means of bolts 24. T he plate 23 .is pivotallyconnected with a short upwardly-projecting journal 25 mounted on theplatform. By virtue of this construction the elements 18,19, 21, 22 and23, constitute a frame mounted to swing from a center coinciding withthe axis of the motor shaft. The bottom frame bar 21 is angleshaped andto its forward extremity is attached a short bar 26 by means of a bolt27. In this short bar is journaled the lower eX- tremity of a sleeve orhollow shaft 28. The

top bar 19 extends forwardly and is provided at its forward extremitywith a short plate or bar 28 having a bearing 28^ in which is journaleda vertically dis osed shaft 29 u on which is mounted a pul ey 30connected y means of a belt 31 with a ulley 32 fast on thearmatureshaft. The s aft 29 passes through the sleeve 28, and its lower extremit1s secured to a horizontally disposed dish-s aped pulley 33 which isconnected by means of an endless belt 34, with a vertically disposedpulley 35 fast 0n the abrading roller 36. Between the pulleys 33 and 35are located guide pulleys 37 which are mounted on a bracket 38 andoccupy an inclined position. By virtue of this construction the abradinroller 36 is rotated upon its axis at a spee slightly greater than thespeed of the armature shaft since the pulley 30 as shown in the drawingis slightly smaller than the pulley 32. It is evident, however, that theinvention is not limited to any particular size of pulleys.

Below the pulley 30, a small sprocket 39 is fast on the shaft 29. Thissprocket is connected by means of a chain 40 with a lar er sprocket 41fast on a shaft 42 provided with a small sprocket 43 which is connectedby a chain 44 with a larger sprocket 45 fast on a hollow shaft or sleeve28. This construction just described forms a speed-reducing connectionbetween the shaft 29 and the sleeve or hollow shaft 28, whereby thelatter is made to rotate much more slowly than the former. The sleeve 28is journaled at the top in a bearing 46 connected with the outerextremity of a forwardly-extending bar 47 fast on the swinging framebar22.

Into the lower extremity of the sleeve 28 is fitted a block 48 throughwhich the shaft 29 passes. This block 48 is fast in the sleeve and isangular in cross section preferably square and its between two dependingmembers 49 fast on the top member 50 of the frame 51 having dependingmembers 52 provided with bearlngs 53 in which rotates the shaft 54 onwhich the bearing roller is mounted. The block 48 is provided onopposite sides with projections 55 which are adapted to engage set bolts56 which may be adjusted to control the rocking or oscillating movementof the frame 51. If these set bolts are raised, a greater degree ofoscillating movement may be permitted, while if they be screwed fartherinwardly whereby they are caused to approach the projections 55, thedegreeof oscillation will be more limited. To'the top of the frame 51 issecured a casing 57A whose upper extremity protrudes into a lar ercasing member 57,

' the latter being ma e fast to the bearing 26A of the plate 26.

A dust collecting hood 58, is located adj acent the abrading roller (seeFig. 6) the said hood being open on the side next the roller to permitthe entrance of the wood dust removed from the floor b the abradingroller. From this hoodacon uit 59 leads to the casmg 57^. From thecasing 57 leads a condu1t60 to a suction device 61 havin an outlet 62.When this suction device 1s in operation, the dust produced b the abrading lroller was drawn into t e hood 58, passes thence to the conduit 59,thence to the casing 56, the casing 57 and through the conduit 60 to thesuction device 61, the said dust being discharged therefrom throu h theoutlet 62. The conduit 60 is connecte with the Swingin frame bar 21 bybands 63 or other suitab e fastening devices. The suction blower 61 isoperated by a belt 64 whlch connects a pulley 65 fast on the armatureshaft with a pulley 66 fast on the blower shaft. The ulleysI 65 and 66occupy planes at right ang es to each other. Two guide pulleys 67 areinterposed between the pulleys 65 and 66 in order that the belt may beheld in proper relation with the last' named pulleys.

A vertically disposed operating rod 68 is slidably mounted 1n the topbar 19 of the swinging frame and also passes through registering oenings formed in the' bearing plate 26 an the overlapping art of theframe bar.21. Between the p ate 26 and a lifting arm 69 made fast to therod 68, 1s a coil sprin 70 which surrounds the rod and is normal y undersuilicient tension to lift the said rod sufficiently to raise the sleeve28 together with the frame 51 carrying the abrading roller. The outerextremity of the arm 69 is bifurcated as shown at 71 and passes betweentwo separated collars 72 fast on the sleeve 28. This lifting arm actingon the upper collar 72, raises the sleeve and the hub of the sprocketywheel 45 acts on the hub of the smaller sprocket 39 which is fast on theshaft 29, to raise the said shaft, sufliciently to lift the abradingmechanism from the surface upon which it is acting. In order to hold theabrading roller down in operative relation with the surface to be actedupon, a lever arm 73 is employed. This arm is fulcrumed vat oneextremity upon a support 74 as shown at 75, while intermediate itsextremities itis ivotally connected with the operating rod) 60 as shownat 76. By pressing down u on the handle 77 of this lever arm, theabradjng roller may be forced against the surface of the floor to bedressed or smoothed.

Fast on the rod 68 is a bearing arm 78 the same being secured by a capscrew 7 9. The free extremity of this arm forms a bearing` which is engaed by the lower extremity of the vertically isposed shaft 1,2,whoseupper extremity is journaled in the top fra-me bar 19.

The abrading roller 36. is hollow as shown in the drawing and upon itsexterior surface sw'ond'a strip' sa offabming substance as sand paper.As shown in the drawing this abradmg substance consists of acomparatively long narrow strip of flexible material having oneextremity suitably fastened at one end of the roller while its otherex-A tremity is fastened at its opposite end of the roller, theintermediate space bein covered by the said strip which is spiral ywound thereon. While any suitable means may be employed for fastening.the extremities of the abrading strip, I have shown in the drawingspecific means therefor, special attention belng called to Figs. 4 to 8inclusive of the drawing.

Pivotally mounted on the hub 81 of a disk 82 of the abradin roller, isan'arm 83 one extremity of whic is provided with a 'aw 84. Upon this armis .pivotally mounte at 85 a lever 86 having a jaw 87. Connected with anarm 88 of the lever is one extremity of a coil spring 89 whose oppositeextremity is connected with the shell of the roller as shown at 90.Normally the spring 89 acts to hold the two jaws 81 and 84 in grippingcontact. When it is desired to fasten one j extremity of the abradingstrip, this extremity is passed through an opening 91 in the shell ofthe abrading roller and placed in position to be grasped by the jaws 84and 87. Preparatory to this operation, the arm 83 is moved in adirection indicated by the arrow in Fig. 8, until an arm 92 of the leverstrikes a pin 93. As soon as this occurs the jaw 87 is separatedfrom thejaw 84 sufficiently to allow the extremity of the abrading strip 80 toenter (see Fig. 6). Then by moving the aim 83 in the opposite directionuntil the\ lever is disengaged from the pin 98, the spring 89 will acton the lever to cause the jaw 87 to close upon the abrading strip whichis then tightly held between the two jaws. At the opposite extremity ofthe abrading roller the opposite end 94 of the abrading strip is passedthrough an opening 95 in the shell of the roller. vRigidly attached tothe shell of the roller on the inside is an arm 96 upon which isfulcrumed a lever 97 as shown at 98. The short arm of this lever isconnected at 99 to one extremity of a link 100 whose opposite extremityis pivoted as shown at A upon an arm B pivotally connected with the arm96 as shown at C. The pivoted arm B is provided with a jaw D cooperatingwithy a stationary jaw E. The extremity of the abrading strip 94 ispassed between these two jaws when the mechanism just described is inthe position shown in Fig. 5. Then in order to lock the abrading stripin place, the lever 97 is, thrust inwardly to the position shown in 7.

From the foregoing description the use and operation of our improvedmachine will be readily understood. `Assuming that the motor is in' oation, movemelltis imparted to t e shaft 29mg thence to the abradinroller 36 by virtue of the construction an arran ement of partsheretofore explained. At t e same time a less rapid motion iscommunicated tothe frame 51 carrying the roller, the said frame rotation a vertical axis or at ri ht angles to the axis of the roller 36. Therame 51 is rotated by virtue of the sprocket wheel and chain connectionsbetween the shaft 29 and the sleeve 28, 'the latter being directlyconnected with the frame in such a manner that the rotation of thesleeve imparts a corresponding rotary movement to the frame. Two motionsare thus simultaneously imparted to the abrading roller, one being arotary travel u on its axis and the other an orbital travel with theframe in which it is journaled, the Jsaid frame rotating on a verticalaxis as heretofore explained. When 'the machine is in use,

the abrading roller mechanism, may be swung freely by virtue of thepivotal connection of its frame with lthe p atform and the armatureshaft .as heretofore explained.

The dish-shaped pulley. 30 at the lower extremity of the operating shaft29 forms a receptacle for any superfluous lubricating material which mayrun down from the bearings above. This is an important feature, since itis not desirable that the lubricating material shall come in contactwith the abrading roller.

The fact that the frame 51 in which the abrading roller is journaled, ismounted to oscillate, has been heretofore referred to. As shown in thedrawing (see Figs. 9 and 10) the depending plates 49 of the frame are'provided with pins F which are made fast therein and protrude intoopenings Gr formed in the block 48. The said pins fit loosely in theopenings G, whereby a limited degree of oscillation for the frame 51 ispermitted. As shown in the drawing this oscillation of the frame 51 isinthe plane of the axis of the abrading roller.

Having thus described our invention, what we claim is:

1. A iioor dressing machine provided with a frame mounted to permit alimited degree of oscillation, means for imparting rotary movement tothe frame, and means for imparting rotation to the said rollerindependentlyof the frames rotation.

2. A floor dressing machine provided with a frame mounted to oscillateto conform to surface changes, an abrading roller journaled in theframe, means for imparting a rotary movement to the frame, and means forimparting independent rotary movement to the roller, the axes of theframe and roller occupying positions perpendicular to each other.

3. A floor dressing machine provided with 4d: m l

an ,apen/deg shaft, an abxodi 191km a um .an :wie tetheaxis-qf frame inwhich the abrading ;ro er Is )ourtheroller.

naled, a dish-shaped pulley at the lovver In testimony whereof we ax om`extremity of the said shaft, said pulley being tures 1n presence of twowitnesses.

5 located within the frame, an o eratlve connection between the said puey und the roller for imparting movement to the latter upon its uxi s,and an operative connection XVitnesses: between the said shaft and theroller frame A. J.0BR1EN,

10 for imparting rotary movement to the latter l DENA NELSON.

